Market share is generally measured in ratings compiled by the Arbitron Company in New York.

"Amerika," an ABC mini-series, lost heavily to NBC's Thursday night prime-time lineup, according to overnight ratings compiled from 13 major cities, the A. C. Nielsen Company reported.

According to the most recent ratings compiled by Project Vote Smart for 2004, he supported legislation back by the A.F.L.-C.I.O. 93 percent of the time, and the League of Conservation Voters 97 percent.

According to ratings compiled by Thomson Financial Services, the analysts' current favorites are FuelCell Energy of Danbury, Conn; Hydrogenics of Mississauga, Ontario; and Proton Energy Systems of Rocky Hill, Conn.

So if a musical program could be created that would attract more women without losing too many men, the net audience would grow, and so would the quarterly ratings compiled by the Arbitron Company.

To determine audience share, the figure is calculated by adding up each broadcasting asset owned by a particular company based on BBM Nielsen ratings data then comparing it to the total audience based on the same ratings compiled across Canada.

The initial ratings compiled by the A. C. Nielsen Company of the nation's top 17 television markets gave "Peter Pan" a respectable 15.1 rating, with 24 percent of the viewing audience.

So the ratings compiled by Nielsen, a division of the Dun & Bradstreet Corporation, remain the basis of more than $15 billion in advertising decisions a year.

Judging by the ratings compiled by Media Metrix Inc., which measures Internet use, they prefer the fast-food approach of the television sites.